今回やること

NestJSの初期化(hello worldまで)
prisma の初期化
postgreSQLの初期化
prisma と postgreSQLの接続

NestJSの初期化

bash

$ npm i -g @nestjs/cli
$ nest new project-name
$ cd project-name

tsconfigの修正

tsconfig.json

{
  "compilerOptions": {
    "module": "commonjs",
    "declaration": true,
    "removeComments": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "allowSyntheticDefaultImports": true,
    "target": "es2017",
    "sourceMap": true,
    "outDir": "./dist",
    "baseUrl": "./",
    "incremental": true,
    "skipLibCheck": true,
    "strictNullChecks": false,
    "noImplicitAny": true,
    "strictBindCallApply": false,
    "forceConsistentCasingInFileNames": false,
    "noFallthroughCasesInSwitch": false,
    "strict": true
  }
}

listen portの変更(3000->3005)

main.ts

import { NestFactory } from '@nestjs/core';
import { AppModule } from './app.module';

async function bootstrap() {
  const app = await NestFactory.create(AppModule);
  await app.listen(3005);
}
bootstrap();

hello world

bash

$ yarn start

localhost:3005でhello world が表示されればok

prisma の初期化

bash

$ yarn add -D prisma
$ yarn add @prisma/client
$ npx prisma init

postgreSQLの初期化

postgreSQL用のdocker-compose.ymlの作成

docker-compose.yml

version: '3.8'
services:
  dev-postgres:
    image: postgres:14.4-alpine
    ports:
      - 5434:5432
    environment:
      POSTGRES_USER: qiita
      POSTGRES_PASSWORD: qiita
      POSTGRES_DB: qiita
    restart: always
    networks:
      - lesson
networks:
  lesson:

DBコンテナの起動

bash

$ docker-compose up -d

prisma schemaの定義

schema.prisma

// This is your Prisma schema file,
// learn more about it in the docs: https://pris.ly/d/prisma-schema

generator client {
  provider = "prisma-client-js"
}

datasource db {
  provider = "postgresql"
  url      = env("DATABASE_URL")
}

model User {
  id             Int      @id @default(autoincrement())
  createdAt      DateTime @default(now())
  updatedAt      DateTime @updatedAt
  email          String   @unique
  hashedPassword String
  nickName       String?
  tasks          Task[]
}

model Task {
  id          Int      @id @default(autoincrement())
  createdAt   DateTime @default(now())
  updatedAt   DateTime @updatedAt
  title       String
  description String?
  userId      Int
  user        User     @relation(fields: [userId], references: [id], onDelete: Cascade)
}

schemaのmigration

bash

$ npx prisma migrate dev

DBの状態確認

bash

$ npx prisma studio

prisma client の更新

Whenever you make changes to your database that are reflected in the Prisma schema, you need to manually re-generate Prisma Client to update the generated code in the node_modules/.prisma/client directory:

bash

$ npx prisma generate